I have twin ca. 1968 Breitling Chronomat 0818’s that are massive at 48mm and 14mm thick (weight unknown).
These two are in extremely nice overall condition with the white dial version being NOS.
This is a manual winding triple chronograph powered by a gorgeous Venus cal. 178 that keeps spot-on time.
These two are among my favorite pieces and get lots of compliments/ inquiries.